Comment by Ftmomo on S-Kyuu Boukensha ga Ayumu Michi: Tsuihou Sareta Shounen wa Shin no Nouryoku 'Buki Masutaa' de Sekai Saikyou ni Itaru - Chapter 1-1

Hmmm, my guess is in the original it written in kanji or something but the "weapon" part of weapon master written in English hence their confusion.